I have a 2000 Excursion 4x4 with a 7.3. It has 295/60/20 Terra Grapplers on it and a Superchips programmer in the performance setting. Brand new air filter and oil change. I filled up and headed out on vacation and drove 602 miles before stopping for fuel again. When I stopped to fill up, it took 41.122 gal. So 602 miles divided by 41.122 gallons comes out to 14.64 MPG. Disappointing to say the least. Anyone have any ideas? Any folks in Myrtle Beach SC out there? Thanks in advance.

My Ex doesn't do very well at all, but I suspect that having a few inches of lift, Ranch Hand bumper, and 325/60-18 tires doesn't help. I am wondering about trying to clean up the front aerodynamics a bit. It might have some converter slip as that appears to be another source of decreased mileage.

I did read that if your exhaust back pressure tube and switchis clogged it will cause poor mileage. I'll look into that possibility when I get back home. There are some good videos on YouTube about 7.3 MPG tips.

That's about right for a stock truck with those mods. You might want a look at doing the In-tank" and "Pre-Pump" mods to remove any air getting into your fuel system. It's cheap and could increase your milage 1MPG or more.

If your running the stock air box - Do the ZooDad mod.
Or upgrade to the 6637 air filter mod - you'll pick up 1 to 2 MPG alone from that (speaking from experience.)
After that - definitely check the EPBS tube/sensor and clean it.

I have not done the hutch/harpoon mods yet - but that's on my to-do list.
But I can say that with new filters, and oil changes and a clean tube - and no tuning - I was able to get 20mpg on the highway at 70mph on my last road trip (not using cruise control either) and I'm about the same tire size as you.

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